Meanwhile, melt chocolate with cream in microwave in 15-second intervals, stirring occasionally. Spread chocolate over warm caramel; sprinkle with sea salt. Refrigerate until chocolate is set, at least 1 hour. DO AHEAD Can be made 3 days ahead. Cover and keep refrigerated.

Cut dessert lengthwise into 4 strips. Cut each strip crosswise into 5 or 6 slices. Transfer to platter and serve.